Hypodermic syringe cartridge



2 Sheets-Sheet l mm w m w i w d 2 z 0 a NOV. 26, 1935. -11$ HYPODERMIC SYRINGE CARTRIDGE Filed July 30, 1952 D. CURTIS v HYPODERMIC 'SYRINGE CARTRIDGE 2 Sheets-Sheet 2 Filed July 30, 1952 INVENTQR David Curtis Patented Nov. 26, 1935 UNITED STATES PATENT OFFICE 2,o 22,sc9

monnamo SYRINGE CARTRIDGE David Curtis; New York, my. Application Jul sir-193a, Serial no. 626,257

a 1 Claim.

The present invention relates to cartridges for hypodermic syringes, particularly to cartridges which may be advantageously used with the type of syringe frame which takes a canula or needle having only one end and in which the cartridge contents must pass through a chamberin the syringe frame-before it passes into the canula.

The cartridges heretofore used with syringes of the type described consisted of. a glass tube, open at one end, such end being closed witha movabe plug. the other end of the tube being drawn out to a point and sealed at the end. In

order tog-{use such cartridges, the end of the tube had to be broken off before being inserted and locked in the syringe frame. was provided with a rubber washer fixed to the frame as its discharge end against which the broken off end of the tube was locked:

It is evident that such cartridges and syringe frames have many disadvantages and drawbacks to their use. First and foremost, the edge of the tube must be evenly broken in order to form a satisfactory closure with the washer. An even break is not always possible, and this failure to obtain it results in a great deal of waste. There is also'present the danger that particles of broken glass might get into the tube contents and re-' suit in the clogging of the. canula opening, or

worse than that, of. getting into the tissues, if they are small enough. 1 The washer forming part of the syringe is also unsatisfactory. It is dimcult to sterilize; Furthermore, a number of sterilization treatment cause such washers to disintegrate. Even without this disintegration, the sharp raw edge of thebrdken tubes cut and lacerate its surface on repeated use, makingthe washer difiicult to sterilize and dropping particles of rubfrom the necessity of breaking any glass portions thereof, and are, consequently, free from any of the evils resulting from the breaking of the tube, such as are described above. The syringe frames that may be used with the cartridges of the present invention may also bewithout any washers, thus eliminating the disadvantages following from the use' of washers with the syringe frame.

The syringe frame ner, and readily sterilized, by its users, any num- 10' ber of times, without the necessity of. replacing any of its parts.

It is also an object of the present invention to provide an improved type ofcartridge for use with syringe frames of the double ended canula type, in which the cartridge remains sealed at all times during its use, and is emptied by means of the inner end of the canula which punctures a diaphragm sealing the cartridge. f

In the accompanying drawings illustrating preferred embodiments of the cartridges of themes-- ent invention,

Fig. 1 is a view in side elevation of a cartridge of the present invention in use with a syringe frame of. the singleended canula type, partly broken away to illustrate the method of its operation;

Fig. 2 is a fragmentary view in vertical section of thedischarge end of the cartridge shown in Fig. 1;

Fig. 3 is a fragmentary view in vertical section of the discharge end of another cartridge of the present invention which is adapted for -use with either type of syringe frame;

Fig. 4 is a fragmentary vertical sectional view of the discharge end of the improved cartridge for use with syringes of the doublev ended canula yp and Fig. 5 is a vertical sectional view of the cartridge asshown in Fig. 3, as used in a syringe 40 frame having cartridgelocking means and a double ended canula.

Referring in detail to the accompanying drawings, the numeral l0 desmnates generally a syringe frame having the cartridge housing portion, ll, 4 a discharge needle or canula, II, which has one end, a finger grip, i3, a plunger, i4, and means, at the plunger end, for locking the cartridge within the cartridge housing portion of the syringe frame, which locking means may be of any desirable type, such as the cartridge locking means shown in Fig. 5, of the drawings which may comprise a sleeve, 21, fitting ovcrthe plunger, I4, and being provided with a threaded lip, 28, adapted to engage the threaded plunger end of the cartridge 66 housing portion II and having the shoulders, 29,

which are adapted to press directly upon the edges of the cartridge, or upon an interposed washer, 30, resting upon the cartridge edges when such sleeve is threaded upon the syringe frame. Situated and locked within the cartridge housing portion H, is a cartridge, generally designated 'as l5, and comprising a substantially straight walled tube, I6, having one. end closed by a piston, H, which is slidable within the tube, I6, and adapted-to coact with the plunger, M, of the syringe frame, 10. The other, or discharge end of the tube, "3, is partially closed by a plug, 3, inserted therein, which plug may be of any materiaL-but preferably of a resilient material, such as rubber, and which has the perforation, l9, extending along its vertical axis. The plug, [8, may either be provided with a portion extending beyond the edge of the tube, to act as a buffer, but may, preferably, be provided, for that purpose, with a radially extending flange, 20, on its outer surface, which flange rests on and covers the edge of the discharge end of the tube, I6.

-The outer surface of the discharge end of the tube, I6, is threaded, as at 2|, or may be otherwise treated in any suitable manner to receive and hold tightly in position and in tight closure over the plug, I8, a cap, 22, which maybe threaded, or otherwise provided with means to cooperate with the engaging means on the outer surface of the discharge end of the tube, It. The cap, 22, maybe of metal or of any other suitable material, such as celluloid, hard rubber, or the like.

The cartridge described above may be very readily filled, without resort to suction, either before or after insertion of the plug, l8, and it may be easily sealed by screwing on, or otherwise attaching the cap, 22, which in order to make a more perfect closure and to prevent any chemical reaction between it and the cartridge contents, may have within it a washer, 23, which may be of any suitable material, such as cork, or rub"- ber. The cartridge will then be airtight and leakproof in the most satisfactory manner.

With very slight modification, the above described cartridge may be made usable with either type of syringe frame. make it also usable with the type of syringe frame having a double ended canula is to provide the cap, 22, with an opening, 24, in line with the perforation, l 9, of the plug, l8, and making the washer, 23, of a resilient material, such as rubber, which will close tightly against the canula which will perforate it.

In order to use the cartridge above described with the syringe frame illustrated inthe drawings, all that is necessary is to remove the cap, 22, leaving the perforation, l9, open to the air. The

open cartridge is then inserted into the cartridge housing portion, ll, while holding the open end up, and locking the cartridge in place, the flange, 20, resting against the seat, 25, provided in the cartridge housing portion, ll, pressing the two tightly together, and forming the chamber, 25, into which the tube contents pass before going into the canula, l2, when the piston, I1, is pressed inwardly.

In order to use the cartridge with the syringe frame having a two er 'ed canula, all that is necessary is to take .rzridge, without re.

' moving its perforated cap, and place the exposed part of the washer, or diaphragm, 23, against the All that is necessary to end of the canula which extendsinwardly into the cartridge housing portion of the syringe frame, pierce the diaphragm with the canula end, and push the cartridge in position in the housing portion therefor. It may here be stated that the cap, 22, may be made of material that may itself forate portion of the plug, 21, forming the dia- 1 phragm which is to be pierced by the inner end of the canula. The plug, 21, is provided with a flange, 20, so that an airtight and leakproof closure may be formed between it and the cap, 22.

This completes the description of the preferred 20 embodiments of the syringe cartridges of the present invention. Many of their advantages have already been set forth and many more will be apparent to those skilled in the art to which the present invention relates. So it will be apparent that the cartridges described in Figs. 2 and 3 may be repeatedly refilled without any trouble, thus proving of great value as a very economical type of cartridge, particularly to hospitals and clinics, where great numbers of them 3 are used.

It may here be stated that the treatment of the discharge end of the tube, which requires the use of a tool, automatically makes the discharge ends of all cartridges of uniform diameter, thus eliminating the necessity to grade the tubes as well as the requirement of plugs of different sizes. This is of great economical value in the assembly of the cartridge, and makes it possible to use parts of the, cartridge over again where it is not possible to use it over again in its entirety.

' While the foregoing is descriptive of the preferred embodiments of the present invention, it is to be understood that I do not wish to be limited be made, without the exercise of the inventive faculties and within the scope and spirit of the present invention and the claim hereto appended.

What I claim is:

A medicament cartridge for use with a hypodermic syringe frame comprising a tube having both ends open, the outer surface of the said tube being threaded at one end to receive a cooperating threaded cap, the plain end of the said tube being closed by a plug movable within it, the threaded end of the tube being partially closed by a substantially cylindrical .plug having a freely open passagealong its axis for'the intake and expulsion of medicament fluid, the said cylindrical plug having a substantially fiat upper sur- 6 face with a radial flange. extending therefrom adapted to cover the edge of the tube and to form a liquid tight closure with the discharge end of the cartridge chamber of a syringe frame when the cartridge is positioned within it, a rigid 65 threaded end of the tube and forming an air 70 tight closure between the enclosed diaphragm, the said flanged plug and tube.

DAVID CURTIS. 

